CN209513049U - Spectrometer dispersive elements and spectrometer - Google Patents
Spectrometer dispersive elements and spectrometer Download PDFInfo
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- CN209513049U CN209513049U CN201822216954.2U CN201822216954U CN209513049U CN 209513049 U CN209513049 U CN 209513049U CN 201822216954 U CN201822216954 U CN 201822216954U CN 209513049 U CN209513049 U CN 209513049U
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Abstract
The utility model discloses a kind of spectrometer dispersive elements, the dispersive elements include diffraction grating one and diffraction grating two, the diffraction grating one is near-infrared transmission diffraction grating, the diffraction grating two is near-infrared reflection diffraction grating, and the limit that the limiting resolution of the diffraction grating one is less than the diffraction grating two divides ratio.Dispersive elements are by using double grating, incident directional light successively passes through the light splitting diffraction of diffraction grating one and diffraction grating two, can have stronger diffracting power, realizes more accurate wavelength measurement, to make spectrometer for the broadband light of bigger wave-length coverage, possess higher light splitting ability.
Description
Technical field
The utility model relates to spectrographic detection technical fields, and in particular to a kind of spectrometer dispersive elements and spectrometer.
Background technique
Imaging spectrometer is one of the key instrument for carrying out target acquisition, identification and elemental analysis.It can be with
The geometrical characteristic distribution and spectral signature information of target are obtained simultaneously, and in geological mapping, environmental monitoring, agricultural economy and science are ground
Study carefully equal fields to be widely used.
The light splitting function of imaging spectrometer is realized by light-splitting device, directly affects the performances such as the resolution ratio of spectrometer ginseng
Number.Light-splitting device is usually made of grating, prism or grating-prism, each advantageous.
Patent document CN201810184071.X " a kind of prism-type space heterodyne spectrograph ", and
That mentions in CN201711251506.X " a kind of total CCD spectrometer of double grating " carries out two to broadband light using two dispersion elements
The spectrometer architecture device of secondary light splitting, wherein the dispersion system mentioned in " a kind of total CCD spectrometer of double grating " is two gratings,
The function of the dispersion group in its apparatus system mainly carries out dispersion light splitting to two spectral coverage ranges respectively, for needing to same
It is unappeasable that the broadband light of one light source, which carries out high-resolution imaging demand,.And a kind of " prism-type space heterodyne spectrograph " patent
The dispersion system mentioned in file is two prisms, and system has the resolution ratio of superelevation, is applicable in atmospheric sounding remote sensing, astronomical observation
Equal fields, however space heterodyne spectrograph itself is an interference system, for complicated coherent light, internal intervention signal becomes
Must be complicated, dynamic range, precision and system performance of detector etc. are limited.
Summary of the invention
To solve the shortcomings of the prior art, the utility model provides a kind of spectrometer dispersive elements and spectrometer.
The solution for solving its technical problem is: a kind of spectrometer dispersive elements, the dispersive elements include diffraction light
Grid one and diffraction grating two, the diffraction grating one are near-infrared transmission diffraction grating, and the diffraction grating two is near-infrared
Reflexive diffraction grating, the limit that the limiting resolution of the diffraction grating one is less than the diffraction grating two divide ratio.
Further, above-mentioned diffraction grating one is the near-infrared transmission diffraction grating of 300 grooves pair；The diffraction grating
Two be the near-infrared reflection diffraction grating of 1800 grooves pair.
Further, the size of above-mentioned diffraction grating one and diffraction grating two is 20mm × 20mm -30mm × 30mm.
The another aspect of the utility model additionally provides a kind of spectrometer comprising above-mentioned dispersive elements.
Further, above-mentioned spectrometer further includes intelligent acess module, light focus module, detector module.
Further, above-mentioned intelligent acess module includes intelligent acess slit, optical fiber collimator.
Further, above-mentioned smooth focus module is achromatism focal lens.
Further, the focal length of above-mentioned achromatism focal lens is 30-70mm.
Further, above-mentioned detector module is line array CCD.
Further, the pixel of above-mentioned line array CCD is 4096.
The beneficial effects of the utility model are: the dispersive elements of the utility model can have more by using double grating
Strong diffracting power realizes more accurate wavelength measurement, to be broadband light of the spectrometer for bigger wave-length coverage, possesses more
High light splitting ability.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described.Obviously, described attached drawing is a part of the embodiment of the utility model, rather than complete
Portion's embodiment, those skilled in the art without creative efforts, can also be obtained according to these attached drawings it
His design scheme and attached drawing.
Fig. 1 is dispersive elements schematic diagram provided by the embodiment of the utility model；
Fig. 2 is spectrometer architecture schematic diagram provided by the embodiment of the utility model.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to the design of the utility model, specific structure and generation
It clearly and completely describes, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is a part of the embodiment of the utility model, rather than whole embodiments, it is based on the embodiments of the present invention, the skill of this field
Art personnel other embodiments obtained without creative efforts belong to the model of the utility model protection
It encloses.Each technical characteristic in the utility model creation, can be with combination of interactions under the premise of not conflicting conflict.
Grating is a kind of common beam splitter, and parallel homogeneous beam is irradiated on grating, can generate different levels
Diffraction, parallel polychromatic light light beam are irradiated on grating, dispersion can be generated, so that different wave length is all satisfied grating equation.
With reference to Fig. 1, the spectrometer dispersive elements of the utility model, including diffraction grating 1 and diffraction grating 24, diffraction
Grating 1 is near-infrared transmission diffraction grating, and diffraction grating 24 is near-infrared reflection diffraction grating, diffraction grating 1
Limiting resolution be less than diffraction grating 24 the limit divide ratio.
The angle of diffraction of each output light is the linear distribution about wavelength, is spread out since the smooth resolution ratio of diffraction grating 1 is less than
Grating two is penetrated, it, can be continuously across diffraction grating 1 and diffraction grating 24 to realize high-resolution point for broadband light
Light.
In one embodiment, diffraction grating 1 is the near-infrared transmission diffraction grating of 300 grooves pair；Diffraction grating 24
For the near-infrared reflection diffraction grating of 1800 grooves pair.
The limiting resolution of grating: Δ λ=λ/(mN), wherein λ wavelength, m level, the line that N light beam covers on grating
Number.Therefore under similarity condition, for groove to more, grating resolution is higher.
Specifically, to the dispersive elements of the embodiment, the directional light after collimation is by first passing around the close of 300 grooves pair
Infrared transmission property diffraction grating 1 is incident on grating face with blaze of grating angle, is dissipated with fixed angle, takes First order diffraction, right
Answering the angle of diffraction of wavelength can be calculated according to grating equation, i.e. diffraction angleiIt may be expressed as:Wherein λ generation
Table wavelength, d are grating length.Its theoretical equation of light resolution ratio is defined as:Wherein N is the dent number of irradiation
Amount, m are diffraction order, the theoretical value approximation of the diameter of the light beam after collimating after can calculating in this way.Then, carry out scattering light
Each light of the first order diffraction light splitting of grid 1 will penetrate θ with the fixed angle of diffractioniEnter, when light injects diffraction light with certain orientation
When grid 24, grating expression formula are as follows: a [sin (θm)-sin(θi)]=m λ.Wherein a is 1/1800, then after the grating of the second level
Broadband light equation of light resolution ratio will increase, realize the super large angle of diffraction spectral dispersion diffraction pattern.
The size of diffraction grating 1 and diffraction grating 24 is usually 20mm × 20mm -30mm × 30mm, as 25mm ×
25mm, 20mm × 20mm etc..
With reference to Fig. 2, it is the spectrometer architecture schematic diagram comprising above-mentioned dispersive elements of the utility model, successively includes
Intelligent acess module, dispersive elements, light focus module 5, detector 6.
Wherein, intelligent acess module includes intelligent acess slit 1, optical fiber collimator 2.Dispersion compensation module includes diffraction grating one
3 and diffraction grating 24, wherein the parameter of two gratings is respectively as follows: the close red of 300 grooves pair of 25 millimeters of x25 mm size sizes
The near-infrared reflection diffraction grating of outer transmittance diffraction grating and 1800 grooves pair.
The incident broad band light for connecing slit 1 from optical fiber first passes around optical fiber collimator 2 and is collimated, by incident diverging light
Collimation is directional light, and directional light first passes around the diffraction grating 3 of 300 grooves pair, and then, the light of variant wavelength will be with fixed
The angle of diffraction projects, and then injects the diffraction grating 4 of 1800 grooves pair, and light will be realized in the same direction after two gratings
High-precision light splitting, finally diffraction light is focused on detector 6 by light focus module 5.
Light focus module 5 can be achromatism focal lens, it is preferable that the focal length of achromatism focal lens is 30-
70mm, such as 30mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm etc..
Detector 6 can be line array CCD, it is preferable that the pixel of line array CCD is 4096.
Further, the signal that detector 6 receives can be for transmission to being imaged in computer.
To sum up, the dispersive elements of the utility model successively pass through diffraction grating by using double grating, incident directional light
One and diffraction grating two light splitting diffraction, can have stronger diffracting power, realize more accurate wavelength measurement, to make light
Spectrometer possesses higher light splitting ability for the broadband light of bigger wave-length coverage.
The better embodiment of the utility model is illustrated above, but the invention be not limited to it is described
Embodiment, those skilled in the art can also make on the premise of without prejudice to spirit of the invention various equivalent modifications or
Replacement, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of spectrometer dispersive elements, it is characterised in that: the dispersive elements include diffraction grating one and diffraction grating two, institute
Stating diffraction grating one is near-infrared transmission diffraction grating, and the diffraction grating two is near-infrared reflection diffraction grating, described
The limit that the limiting resolution of diffraction grating one is less than the diffraction grating two divides ratio.
2. dispersive elements according to claim 1, which is characterized in that the diffraction grating one is the close red of 300 grooves pair
Outer transmittance diffraction grating；The diffraction grating two is the near-infrared reflection diffraction grating of 1800 grooves pair.
3. dispersive elements according to claim 1 or 2, which is characterized in that the diffraction grating one and diffraction grating two
Having a size of 20mm × 20mm -30mm × 30mm.
4. a kind of spectrometer, which is characterized in that including dispersive elements as described in any one of claims 1-3.
5. spectrometer according to claim 4, which is characterized in that further include intelligent acess module, light focus module, detection
Device module.
6. spectrometer according to claim 5, which is characterized in that the intelligent acess module includes intelligent acess slit,
Optical fiber collimator.
7. spectrometer according to claim 5, which is characterized in that the smooth focus module is achromatism focal lens.
8. spectrometer according to claim 7, which is characterized in that the focal length of the achromatism focal lens is 30-
70mm。
9. spectrometer according to claim 5, which is characterized in that detector module is line array CCD.
10. spectrometer according to claim 9, which is characterized in that the pixel of the line array CCD is 4096.
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| CN201822216954.2U CN209513049U (en) | 2018-12-27 | 2018-12-27 | Spectrometer dispersive elements and spectrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682474A (en) * | 2018-12-27 | 2019-04-26 | 佛山科学技术学院 | Spectrometer dispersive elements and spectrometer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682474A (en) * | 2018-12-27 | 2019-04-26 | 佛山科学技术学院 | Spectrometer dispersive elements and spectrometer |
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Effective date of registration: 20210708 Address after: 528000 one of the fourth floor of Building 1, block 2, No. 117, Zhangcha 1st Road, Chancheng District, Foshan City, Guangdong Province Patentee after: GUANGDONG WEIREN MEDICAL TECHNOLOGY Co.,Ltd. Address before: 528000 Foshan Institute of science and technology, Xianxi reservoir West Road, Shishan town, Nanhai District, Foshan City, Guangdong Province Patentee before: FOSHAN University |